The Wolf of Wall Street hunk was in London for a screening of his climate change documentary, Before the Flood — and just two days before his hush-hush hookup, Leo took 24-year-old Nina house huntin in Malibu!

Leo’s secret rendezvous is certain to stun insiders, who believed he’d finally found his perfect match in Danish stunner Nina after dating a string of knockouts, including Bar Refaeli, GiseleBundchen, BlakeLively and KellyRohrbach.

“HE’s found the perfect girl,” once source snitched. “After flings with dozens of the world’s most beautiful women, Leo knows he’s met his match, and is eager to start a family.”

Another source dished: “This isn’t just another of Leo’s hookups. There are real feelings there.”

He’s not ready to propose or anything, but he can definitely envision a future with her.”

Although Leo may not be ready to put a ring on it, the couple has been talking marriage, and even picked next Valentine’s Day – his mom Irmelin‘s birthday — for their nuptials, according to another source.

“Leo and Nina are scouting for the perfect location while she shops for a wedding dress,” added the source.